From: Andrey Smetanin <asmetanin@xxxxxxxxxxxxx>
Allow for arch-specific interrupt types to be set. For that, add
kvm_arch_set_irq() which takes interrupt type-specific action if it
recognizes the interrupt type given, and -EWOULDBLOCK otherwise.
The default implementation always returns -EWOULDBLOCK.
Signed-off-by: Andrey Smetanin <asmetanin@xxxxxxxxxxxxx>
Reviewed-by: Roman Kagan <rkagan@xxxxxxxxxxxxx>
Signed-off-by: Denis V. Lunev <den@xxxxxxxxxx>
CC: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
CC: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
CC: Gleb Natapov <gleb@xxxxxxxxxx>
CC: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
include/linux/kvm_host.h | 4 ++++
virt/kvm/eventfd.c | 13 ++++++++++++-
2 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index b66861c..eba9cae 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -828,6 +828,10 @@ int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
int kvm_set_irq_inatomic(struct kvm *kvm, int irq_source_id, u32 irq, int level);
int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm *kvm,
int irq_source_id, int level, bool line_status);
+
+int kvm_arch_set_irq(struct kvm_kernel_irq_routing_entry *irq, struct kvm *kvm,
+ int irq_source_id, int level, bool line_status);
+
bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin);
void kvm_notify_acked_gsi(struct kvm *kvm, int gsi);
void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index f6b986a..e29fd26 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -171,6 +171,15 @@ irqfd_deactivate(struct kvm_kernel_irqfd *irqfd)
queue_work(irqfd_cleanup_wq, &irqfd->shutdown);
}
+int __attribute__((weak)) kvm_arch_set_irq(
+ struct kvm_kernel_irq_routing_entry *irq,
+ struct kvm *kvm, int irq_source_id,
+ int level,
+ bool line_status)
+{
+ return -EWOULDBLOCK;
+}
+
/*
* Called with wqh->lock held and interrupts disabled
*/
@@ -195,7 +204,9 @@ irqfd_wakeup(wait_queue_t *wait, unsigned mode, int sync, void *key)
if (irq.type == KVM_IRQ_ROUTING_MSI)
kvm_set_msi(&irq, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1,
false);
- else
+ else if (kvm_arch_set_irq(&irq, kvm,
+ KVM_USERSPACE_IRQ_SOURCE_ID, 1,
+ false) == -EWOULDBLOCK)
schedule_work(&irqfd->inject);
srcu_read_unlock(&kvm->irq_srcu, idx);
}
--
2.1.4
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